A Cold Atomic Fermi Gas with a Spatially Modulated Interaction

Details A Cold Atomic Fermi Gas with a Spatially Modulated Interaction A Cold Atomic Fermi Gas with a Spatially Modulated Interaction

2006-10-30

arxiv.org/abs/cond-mat/0610844v2

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures, replaced with eps figures

Scientific paper

We study an ultra-cold atomic Fermi Gas with the atom-atom interaction modulated periodically in space. A novel ground state with cooper pairs occupying non-zero center of mass momenta is found. Such a state is closely related to the state proposed by Fulde, Ferrell, Larkin, and Ovchinnikov(FFLO). The resultant single particle excitations with momenta along the direction of the modulation shows multiple-gap structures. Such a system can be realized in experiment with a spatially modulated Feshbach resonance. Experimental signatures of such a state are discussed.

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